<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        .test {
            width: 100px;
            height: 100px;
            background-color: tomato;
            word-wrap: break-word;
        }
    </style>
    <title>Document</title>
</head>

<body>
    <div class="test">
        <!-- <div class="test1">
            111111111111111111
        </div> -->
        111111111111111111111111111
    </div>
</body>

</html>